My 2004 GP has a "gurgling/sloshing water sound when I accelerate from a stop...or even when I rev engine while parked. Sounds like it is in the dash??? Sounds like a mixture of water and air going through a pipe?
U HAVE A BLOCKED AC CONDENSATION DRAIN TUBE, IT EXITS AT THE BASE OF THE ENGINE FIREWALL UNDER THE CAR ON THE PASSENGER SIDE.
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Check the ENGINE coolant level,it may be low.
Revving the engine while parked almost guarantees the engine coolant level is low and you are hearing coolant mixed with air running through the heater core..
Don't just check the overflow bottle IF you have a separate rad cap.
Otherwise correct the level in the bottle and recheck after driving.
You may have a coolant leak...so check for that.
Open the cap (COLD ONLY) and check the level of coolant.
Use a mixture of 50% antifreeze and 50% water to correct the level.
Also check for a bleeder screw somewhere high on the coolant system (usually on the water neck); newer systems are very hard to get all the air out of. if you've got one start the car with reservior full and heater temp switch on hot, open bleeder until no more air comes out, close bleeder, check res. level.i had this problem on an olds i had, i have since installed a bleeder on every vehicle i've had, they're @7 bucks from a g.m. dealer
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